Colback started in central midfield for the first time since February in Sunday's Wear-Tyne derby and rewarded Gus Poyet's faith by shining in the 2-1 triumph over Newcastle United.
He told the Sunderland Echo: "Midfield is my position.
"A lot of people have asked me where is my position and it's obvious I'm not a left-back.
"I filled in there, but I've never been a left-back.
"I'm a midfielder and that's where I want to be, so hopefully I can get a run in the team there.
"The manager didn't even have to ask. He said he knew I wasn't a left-back, although I don't know whether that was a compliment or not!
"But he said I'm going to be playing midfield and now it's up to me to show I'm good enough in training and in games."
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